It's very good for an idea to be commonplace. The important thing is that a new idea should develop out of what is already there so that it soon becomes an old acquaintance. Old acquaintances aren't by any means always welcome, but at least one can't be mistaken as to who or what they are.

Morality is seldom a safe guide for human conduct.

An unjust punishment is never forgotten.

To every separate person a thing is what he thinks it is – in other words, not a thing, but a think.

I believe that people should write biographies only about people they love, or understand, or both. Novels, on the other hand, are often better if they're about people the writer doesn't like very much.

Helping other people is a drug so dangerous that there is no cure short of total abstention.

The body, then, has a mind of its own. It must follow, then, that the Mind has a body of its own, even if it’s like nothing that we can see around us, or have ever seen.